Cross-site scripting in HTML Sanitizer - CVE-2026-47345

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Main Vulnerability Database Vulnerabilities #VU134018

Cross-site scripting in HTML Sanitizer - CVE-2026-47345

Published: June 9, 2026


Vulnerability identifier: #VU134018
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-47345
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary script in a victim's browser.

The vulnerability exists due to cross-site scripting in HTML serialization of namespace attributes when processing sanitized HTML content. A remote attacker can supply specially crafted input to execute arbitrary script in a victim's browser.

The issue allows bypassing the cross-site scripting prevention mechanism.


Affected software

HTML Sanitizer
TYPO3

How to mitigate CVE-2026-47345

Install security update from vendor's website.

HTML Sanitizer - update to 2.3.2
TYPO3 - addressed in versions 10.4.57, 11.5.51, 12.4.46, 13.4.31, 14.3.3

External References

Related Security Bulletins